Use fail_on_error=False in det_cmake_version().

It handles errors itself already by just looking at the output,
no need also do it in run_shell_cmd here. This fixes the test
case for det_cmake_version().

easybuild/easyblocks/generic/cmakemake.py

@@ -63,7 +63,7 @@ def det_cmake_version():
         regex = re.compile(r"^[cC][mM]ake version (?P<version>[0-9]\.[0-9a-zA-Z.-]+)$", re.M)
 
         cmd = "cmake --version"
-        cmd_res = run_shell_cmd(cmd, hidden=True)
+        cmd_res = run_shell_cmd(cmd, hidden=True, fail_on_error=False)
         out = cmd_res.output
         res = regex.search(out)
         if res: